Sound-box of phonographs.



PATENTED JULY 3, 1906. 'A. FISCHER.

SOUND BOX 0F PHONOGRAPHS.

APPLICATION TILED MAR. 14, 1905.

I end of the st 1118 -bar.

' sound-collecting holes are emp oyed, situated or sound-exit tube.

' UNITED STATES PATENT OFFICE.

ALEX FISCHER, OF KENSINGTON, LONDON, ENGLAND.

SOUND-BOX OF PHONOGRAPHS.

Patented July 3, 1906.

Application filed March 14. 1905- Serial No. 250,108.

To ZZZ whom it may concern:

Be it known that I, ALEx FISCHER, a subject of the King of England, residing at 18 Hazlitt road, Kensington, London, En land, have invented'certain new and usefu Improvements in or Relating to Sound-Boxes of honograghs and I do hereby declare the following to e a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in the sound-boxes of phonogra hs-that is, instruments by which the mec anical effect of vibrations of sound can be recorded on a suitable moving surface, such as a cylinder or disk, and reproduced from such surface.

The invention has for its object the reduction of the over andfalse vibration of the diaphra of the re roducing and recording soun -boxes. To t 's end I divide the diameter of the diaphra into about thirds by placing on each of tfi d two points of division a dome or bearing-piece. The two domes or bearing-pieces carry and are directly connected to a common stylus-bar carrying (preferably at is middle) the stylus. The domes or 'bearin -pieces and the common stylus-bar carrie by them lie in a direct line with the longitudinal axis of the sound-box connection In the case of disk-machines or gramophones I connect the bridge to the diaphragm of the sound-box at two points (the points of division dividing the diameter or axis into about thirds) over one another in a line with the stylus-bar. The connecting-pieces may go through the diaphragm in the usual way, the stylus being at the lower By reference two under the division-points of the diaphragm and leading into the sound-exit tube for either 0 linder or disk machines. I have also app iedthis arrangement with success to two independent sound-boxes which are placed in front of one another across the record for cylinder-machines and on the top of one another for disk-machines. These independent sound-boxes are directly connected together through a common stylus-bar and a common exit-tube and have one common reproducing stylus.

In order that my invention may be better understood, I proceed to describe thediaphragm 1), upon which are mounted two domes c d as bearing pieces, carrying a brid e e, made of metal or other suitable materia In the middle of this bridge is fixed the stylus f, which may be an ordinary stylus. I find in practice that the best position for the domes 0 dis about one-third of the diameter from the edges of the sound-box.

The bridge and domes are shown detached in elevation at Fig. 5. These domes may be round oblong elliptical spiders or of any other suitable form.

With reference to Fig. 4 it will be seen that I provide two sound-boxes each of which communicates with the tube g, and these sound-boxes are each provided with the domes and bridge, as in the case of a single sound-box. The two bridges are connected toward their middles by means of a secondary bridge h, carrying at its middle a reproducing or recording stylus.

With reference to the application of my in vention to disk machines or gramophones it will be seen at Fig. 3 that I apply my bridge and domes in a similar manner to that already described, 'and I preferably connect to the middle of the bridge c the bar "5,, which bar carries on its lower end the needle or stylus.

Although I have shown the bridge 6 mounted on domes, I do not Wish to limit myself to this particular method, as it may be found advantageous to attach the stylus bar or brid e direct onto the diaphragm by a flange or ot erwise. In the case of disk machines I may employ connections, screws, or the like which pass through the dia hragm in the ordinary way to attach the ridge thereto, or the brid e may be otherwise suitably connected the diaghragm at two oints.

It may be advantageous to ma e the soundscribed reproduction is found to be much clearer than when the stylus is simply fixed onto the center of the diaphragm.

What I claim, and desire to secure by Letters Patent of the United States of America, 1s

1. A sound-box comprising the box proper and a diaphragm with a sound-tube arranged parallel to the plane of the diaphragm, a bridge connected to said diaphragm at two or more points in line with said tube, and a stylus carried by said bridge, substantially as described.

2. A sound-box, comprising the box proper, of elliptical or oblong shape, and a dia hragm with a sound-tube arranged paralle l to the plane of the diaphragm, and a bridge connected at two or more points to said box in the direction of the axis of the soundtube, substantially as described.

3. A sound-box, comprisin a box provided with a sound-tube, a diap ragm, domes attached to said diaphragm, abridge connecting said domes, and a stylus centrally mounted on said bridge, said bridge, domes and stylus being mounted on a line parallel to the sound-tube, substantially as described.

4. A double sound-box, comprising two separate boxes placed side by side with a sound-tube running longitudinally thereof, each box being provided with a diaphragm, domes secured to said diaphragm, a bridge connecting said domes, and a bridge carrying a stylus connected to said firstnamed bridges, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

ALEX FISCHER.

Witnesses:

A. E. VIDAL, H. D. JAMESON'. 

